Very tempted to get a rear sway bar for my '10 3-door, but wondering if any other Toyota products had a swaybar from the factory, that I could just get cheap at the pick-a-part? Perhaps some sort of Scion?

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They make a big difference! Mine is 17mm and works fine,but wish I would he got the 19mm. I have a sedan,so I have a bit more rear overhang.
For normal day to day driving with some "spirited" interludes... the 17 will be fine and then some.

Is the rear sway bar something a guy with a chop saw, drill press, and a mig welder could make?
I really like fabricating versus buying if possible.
Also.....any pictures of sway bars installation projects?

Is the rear sway bar something a guy with a chop saw, drill press, and a mig welder could make?
I really like fabricating versus buying if possible.
Also.....any pictures of sway bars installation projects?

Good point. Would you say unless he's racing on a track, he doesn't need bigger?

What I like about the TRD one, it fits perfect. I have seen some other brands that hang lower then the TRD, that's what I didn't like.

It depends on your suspension setup, racing or not. I was about to get the 21mm, but ended up with the TRD because it was way cheaper.

Anyways, with the MI springs, its impossible to drive in the winter because they are so stuff up front that make the cars understeer massively. The swaybar will correct this, and the TRD makes it very neutral, very predictable. Going with the UR 21mm will make the car oversteer more. Very useful when racing, and exit a corner at even higher speed.

It depends on your suspension setup, racing or not. I was about to get the 21mm, but ended up with the TRD because it was way cheaper.

Anyways, with the MI springs, its impossible to drive in the winter because they are so stuff up front that make the cars understeer massively. The swaybar will correct this, and the TRD makes it very neutral, very predictable. Going with the UR 21mm will make the car oversteer more. Very useful when racing, and exit a corner at even higher speed.

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Yeah that I knew going 21mm is best for racing but at the time I was probably only intending to do occasional lapping. Now I'm about to get to the point of no return, meaning modding to race. Mine doesn't see winter!

Is the rear sway bar something a guy with a chop saw, drill press, and a mig welder could make?
I really like fabricating versus buying if possible.

an anti-roll bar is a torsion bar, kinda like a spring. the steel is mathmaticly twisted when it is formed. to build one would require some kind of twisting machine and some forging hammers and some fancy dial calipers and lots of math, minimum. you can however build ladder bars and strut bars as they are not sprung steel but rigid body suspension....